Five Hundred Year Diary and Filigree Sages on the battlefield.
You control at least four Clues.
Steps
Activate Five Hundred Year Diary's first ability by tapping it, adding at least ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Activate Filigree Sages by paying ({2} magic symbol) ({U} magic symbol) , untapping Five Hundred Year Diary.